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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '890eea41a0f06ac63b48ec9b933b12766bd1ed753636527a790c8b3245a1e632' 
  AND token = '65lmGx2dNAORVWwvLUd+by04AhAh0lOVV9JVTyt7Ew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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