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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2ef488700377f7a7bc14c51408b9d39994b5c0d256595c947f576a7aa1e8766' 
  AND token = 'vJiN5tqx37jD41cvTX7xm449yCwciAz6z7hryX8qySc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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