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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40a97e4badacb012a9f55fe99317de83684e39210f559bded5e8b829fdc25c31' 
  AND token = 'oy9YKskZUftNGZ36F9Fv6fvaj4KsTWwhIkE5oE/Yis0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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