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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5eea1313ee8279f84097e2ac12c65f4628aa310448cfb050821ae3f9a1b3ad3' 
  AND token = 'htTmInK5HvjHw1b0UBc/AbFBDnf6L7xQjbKPMbKbEQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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