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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e23dbb3bae202ae6f034e010b9fa24f95c06af4998e9a2457a7a902ba3c4df21' 
  AND token = 'HhsRWiHHIHhe+THYApGVhXtqWT7SiBXU2fh2pBlHzPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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