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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3de9a76e81ce3e8d7440d654471cf31bc83449a2489189ceba54f0beb6b69bf2' 
  AND token = 'wnj/w5tUtcdIj2nzs5++4zlFUIRIWQ6hdHfVkzQ1otQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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