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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcd26a01ddc61525c649612ee4e938bb1f029e9b907f1ad701b6086b89ad552d' 
  AND token = 's1NICi/pFDHN1wI2YMnV+lxgM9fkJzxM04oAH1Q+at0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}