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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c727a200fca2ab77ecd6fa73d75cd18df9e0bc8338aa520b34320c198be989ec' 
  AND token = 'FKTNYI2Mwz1vejEcVazGb25AArtJSFCEgDRfQg7TLbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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