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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d84d67cb48192152c27ff0199ce264947b12d0aafe1af853f3fc9210d9fda43' 
  AND token = '3qxjHIX2yuLAaMpoenUyEOjrpgJaxR6jgfFoLgVWVHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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