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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8a26ad2a981d1c3982add5771f3f5be780b10078c572c9dc8e6324c05d77878' 
  AND token = '7YWH4EdCddSPtBX3wpWbWpSr7p8LKZRb+F7d1r8oFcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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