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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e7d304fe45a89c884a3c90b326defe881d24a2fc6dc3de4016c958f34a79912' 
  AND token = 'pCG7SdnrtWp4LnlQ1fnxc5RveRaP4b/+E5hvVf/Krv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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