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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cec20aac48da9b9998fec7f9e432f7a158c93a840fdc8253e54e2c746ebdb86' 
  AND token = 'e6l3UDQaEuxMYBebFLf6SSY1dibvWqzW+KyYjVnrB3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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