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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9cad542ca7a9fce327d8538dccdf7c2345164a6058cd91b02988ac88427bf485' 
  AND token = 'gg70NJJ4laqdoMRrCAd1fG89G4aJaCoz+epw8GU/Spo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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