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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8c76db1648692b82fae2a2c254cfc928d64a7f5ef3d536b8a05b65350fe4d1c' 
  AND token = 'IUmn1ZjS14ZkAB6Uy3w2KO6ZbpQj3LAbvKr50yEaxVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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