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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca22e33b6fd5cee301765ae44c2f555ac83de1a47e816e290e158d0543b71ee9' 
  AND token = 'hpsh8aShm+n5RPo+COPIG5Cn0D+wv/NzbQieo6/jcFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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