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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b73a5324f1a750e7ed94c9963f1a2ef578dd290745d784ab01cf8cd5dd5f394' 
  AND token = '8pFSOX8QjrsLB56IWQ2Q0J6v3YHTl3522IGWJvftvew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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