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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5466b8751f9f5063489af30c73aec39f870f06b2818bde60d750b8f7ffacb2ae' 
  AND token = '0XyxBAbsPvCWz8nPIJJ8m6RdW6h7kX/4lLzm6731i0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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