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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbbea4abae6123b382703cf5aed32a3202f32799482e7df50bae987452347d02' 
  AND token = 'NtOKwP+Lq+gpW9oOlsGDMaOJadkYx+MM0dWpDD9oW0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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