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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2839dbac9bfab1666c05170b3b60b1b45feef0986416b5300bdece8743832472' 
  AND token = '+1SjK2AJO2T+E/jMQj2ac0g0uOWfLrdyJjBMkWhb+pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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