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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2bbe0f8bf62c726c43a6760df4aaa3cce45d15dc2d6c8e636671ef104c86621' 
  AND token = 'gr4MCih72Ug5lQD1V1uk+2ng19QbmRQP63Z8DKUdWXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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