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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fbde42f56de039182f1a0095e6b19d2b881582baeb97b3ffa7a7d3b72b048a8' 
  AND token = 'Z3x1x48czHQ2EwH0S3oNTMt/IZ2URSH9Rlrnl5L+A84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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