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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58067ad572a73370e869c5baecc0f738d6d60e52ab6dfa0c2eb15303c2856f87' 
  AND token = 'suXbgn3pi2dMW4r31NLOwyGRj8ynZjdmb1JllF1Co+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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