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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '989ea4350f6454b8f894393acf0e594ee6b304de721c18154d6e43b5eb460706' 
  AND token = 'U7G7vWZm5Kaelo4T/Nw0TlPjToWm3ZRegjSgsVPKsJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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