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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '402f3a93661354128541da850154698816109c6045a8f7c70804d92b7748fab4' 
  AND token = '2P7xTC9XflfEDHh+fS8xH2PBzkAzD6Xw9cKC6iN8hlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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