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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f364d5d2c0d87b2ede1192680044670ce9a330ce74d1b78ebb1210bd83bdddd' 
  AND token = '+lh6ytSykanOsgjlL5f5reE7fkkVwri30jpuON4HUig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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