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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c37b5aaecc479806a395fdaa27086fb6415d3fa6ca826973ed85444e87d6bbcb' 
  AND token = 'IIf/bjT67c7P2C1Fyc9xHcJJocpGtpZvFyDGR+LMSA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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