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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f0299a77577e07ae71eaf4c93ecf9d67553c5e7b07949e1108306e39453c6a' 
  AND token = 'rRox945mOBAeom0lwZwpHYJxBwD8fAvShvTSn8wvrLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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