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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94d5570bce64d1219ca8ce580ef0553d2d81ebb9890c01ac8fafa61bab604478' 
  AND token = 'rqwORIri6iRqUn6sgxClisU2Z7f6oPpReeKqGrm7IG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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