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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99997f2ad5a9010ee5ae53e3b10a3906816b67980e6e0e9fdf81f64a330b8e80' 
  AND token = '3D/RrbNAFk4YBp7MmRWSguO9QTE0WQi8FBJLnKvwI6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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