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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c20fb52263b283770fda27006970bcd47fe60d4970d2b879c8b03ba4b1d1e9' 
  AND token = 'UOs68K1pb3pt1KIUaLGQaiAe6NgJkBPm4kAG6GOjKJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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