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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '656fabb21f4c88bfbae0e7e0534bfdd4210e04cba8c95bfd31f1fee237360641' 
  AND token = 'PdQF5om2O3RZkHI5cRVfUzGJqqo27o1TEHBAs5Q8FhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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