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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d994453a3767721a5f4ee3b61f9e950782ace5be554c72ccf5e2d50c8d631c8' 
  AND token = 'ekr0gWYkW/0pIPPrsFzcsBHKnHmibEWUaXvo+EigwLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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