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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dbd5ed5e85562461e04c877d65435fad96229e6c67e27eb696e79498835d330' 
  AND token = 'A69FHk0pdNomNASBk2huHOZQofr650Be/pms46xfYc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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