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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96a2128dae79225264c2a2c7e374fe87fa2f7d1c36ae565e90e8a0d31aa3d1a7' 
  AND token = 'vdG9+fAAiGszcx4Av4ud3JkkZek+qubz4//XDohGa4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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