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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99eec3a72c8f6a8729ae4e86ce35e4a7cf3ae14a35ffac6f6e9702d4ae599804' 
  AND token = 'O7x7CPnMy4B8dAlNpnxSLm4hwiNlgEXS9BM4Cn7V/9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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