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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a064f6f4f6189151c69404995b6d4547c379dfbaa8b43cea105cbcfaaa1c4a84' 
  AND token = 'GWVtu80X1QsOB1zr2FvvsSScGoDWB/VEW5Wk8k5m50E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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