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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f5b5b236c78324d93ecfb09265eed495c0b3112c9bb41c23f91135620eda5ef' 
  AND token = 'Fd1HiW12nNd3QpZApehrozFoFfn33K6ihdi7THEOZIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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