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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc67288caa3ff32bbdb00b043660b4c8fc567cc95c9aa750cb5ae80f358d37e0' 
  AND token = '0fv9aGge2bOoRzbX0e/bDauasELleIcmwdPXE6S6Xj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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