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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4101c503c22bb019630ef480173c6a1041893cbd3b87381cae41a4e8b79ecb82' 
  AND token = 'jITtTOqBzL4A7x6l7MH9F2G9khxK7cLKa3Ie8JUET6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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