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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a105f9630a9dea5a5c48dd1df9f01b338724317c6fbb9b9e8d6db7e40f3e3ac2' 
  AND token = 'syd6dTjb0sJy8OTLvFKUP1SOYTOH80PVQASGDbl56vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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