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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae4bdd7ee413663ff0215975383329b2ce651c06a3a2b376f73d75704f913d10' 
  AND token = 'lnl8EoT17YW3DQyQXp9Me/liSYlG0meborX1vau2xRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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