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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d4755c315de23211b6cde8045724d4229c2d3a9bcabfc1c168e962b951ee459' 
  AND token = 'IDKjs8QeRJcaGJkuQJ6uT07HgEMLm6svEKvo3q1hL4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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