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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '170e0a588606aef9371188e039b3ac826559e11346745902509c379798fe8470' 
  AND token = 'timWCrN3tAczP6rr0GEvR0Ux3C12oDfAJrzcT41KTAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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