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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfff2bd07a526b0d64e31cdc6055cb5f7a2456f76c7aeb2c45e0a349d2848d81' 
  AND token = 'sc4oYE7NciQ8uAsW0OJZbWdPFSm9Yl3At7I/ITlLU4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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